Traveling screen



Dec'- 8,1925.

B. SCHROEDER TRAVELING SCREEN Patented Dec. V8j, 1925.

UNITED STATES PATENT OFFICE.

BERNHARD SCHROEDER, OF CHICAGO, ILLINOIS, ASSIGNOR TO SARGENT & LUNDY,

` INCORPORATED, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TRAVELING SCREEN.

Application led December 26, 1924. Serial No. 758,047.

To all 'whom t may concern:

Be it Iknown that I, BERNHARD SCHROEDER, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Traveling Screens, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, formlng a part of this specification.

My invention relates to an improvement in traveling screens such as are employed 1n electric power plants, industrial establishments, and sewage disposal plants for screening the water passing through the intake umes or other large Hows for removing ice. fish, leaves and twigs, and other undesirable dbris.

Such traveling screens are customarily an' ranged with their side edges juxtaposed and at their ends are connected with links which form a double-link chain at each side of the screen. In these double-link chains the links are of course arranged in pairs but because the screens are secured directl to each link of the chain, the individual links of each pair have not worn evenly with the result that frequent replacements are necessary. One object of my invention is the provision of a traveling screen of this type wherein the screens are carried directly by both links of the pairs whereb the wear can be equalized and the life o the links prolonged.

Another object of the invention is the provision of a-single connecting member for securing the end of the screen to the chain in such a manner that an individual screen may easily be removed from the screen without the need of pulling the chain out of its normal alignment or disturbing the pivots of the chain. I also contemplate a means of attachment for the ends of the screen whereby a single connecting member at each end of the screen is used to secure the screen to both links of the chain so that the two connecting members, one at each end of the screen, are all that need be used to ysecure the screen tol the chain or elect its removal. These and further objects otb my invention will be best understood from the following description of a particular traveling screen of a vertically disposed traveling screen showing one screen unit and portions of the adjacent screen units;

Figure 2 is a longitudinal section taken along the chain on the line 2 2 of Figure 1;

Figure 3 is a longitudinal section similar to Figure 2 but takken through the screen alongthe line 3 3 of Figure 1, and

Figure 4 is a transverse horizontal section taken along the line 5-5 of Figure 1 transversely of the chain and showing the attachnient of the screen thereto.

The screen members are formediby rectangular frames 10 having guard strips 11 and 12 clamped along the upper and lower sides of the frame respectively and anI le strips 13 secured by rivets or other suita le means along the ends of the frame. A piece of screening 14 which may be either wire or punched metal is secured to the downstream side or back of the frame and has forwardly bent upper and lower marginal flanges which project between the sides of the frame and the guard strips 11 and 12 respectivel and are clamped therebetween as shown 1n Figure 3. Similarly the ends of the screen 14 are bent forwardly and clamped between the ends of the-frames and the angle strips 13. Narrow obliquely disposed buckets 15 are preferably provided along the bottom edges of the screen units to carry up pieces of dbris which do not adhere to the screens.

The chains which extend along the sides .of the row of screen units and at the ends of the individual screens, are formed from pairs of spaced links 16 connected b pivot pins 17 opposite the spaces between t e juxtaposed sides of the screens so that the distance between pivots on the chain is the same as the distance between similar points on the successive screen units. There is thus one 'screen unit for each successive pair of links along the chain.

As shown in Figure 4 the outwardly projecting flange. of the angle strip 13 lies;

against and along the forward edges of the links 16. Midway between its ends the strip 13 carries a block 18 resembling a bearing block which is riveted to the outwardly projecting flange of the angle strip and which projects between the spaced links. A short locking pin 19 passes through aligned holes in the links and the block 18 and preferably extends also through aligned holes in the opposed liange of the angle strip 13, the forwardly bent edge of the screen 14 and the adjacent side of the frame 1t). A cotter pin holds the locking pin 19 against longitudinal displacement.

When the locking pin 19 is in place the angle stri 13 is held against the links so that the links are in effect rigidly lixed to the screen and there can be practically no movement of the links independently of the screen or independently of one another. The weight or other resistance caused by the screen unit is therefore carried equally by the two links, particularly as regards their points of wear at the pivot pins. .It will thus be seen that by fixing both links of each pair rigidly to the screens, any twisting or play of the links is prevented and their bearings for the pivot pins are kept aligned as well as being given equal loads to carry. This construction will cause the links to wear more evenly and prolong the life of the chain generally as well as eliminate the necessity of frequently replacing individual links which have become defective by excessive wear.

When a particular screen and its frame is to be remo-ved for repair or to permit replacement it is not necessary to pull the chain out of its normal alignment nor in any other way to disturb the chain. rllhe locking pins 19-one at each end of the screen unit-are withdraw and the screen is then free to be lifted out of its place. l prefer to extend the locking pin 19 through the frame l0 as it makes the cotter pin more accessible, and facilitates driving the locking pin out. I contemplate, however, that instead of extending through the adjacent side of the frame the locklng pin 19 can terminate between the inner link 16 and the adjacent flange of the angle strip 13 and the cotter pin be inserted in the space therebetween.

It is also to be pointed out that although the block 18 is disposed between the links 16, it is located midway between the chain ivots 17 and is not long enough to interere with the sprocket wheels over which the traveling screen passes and which engage the rollers 20 mounted on the pivot pins 17 between the spaced links.

The guard strips 11 and 12 at the upper and lower sides of the screen units are conformed to telescope arcuately as will be seen from Figure 3 to prevent the'passage of inseam water or dbris through the spaces between the juxtaposed edges of the screens. It will be understood of course that for the sake of clearness the guideways in which the chains travel have been omitted from the drawing and that in practice the forward flanges of the guideways will extend over the chains substantially as far as the ends of the screens 14 for precluding the passage of water or dbris around their ends or past the chain. pivots.

While I have thus described one particular embodiment of my invention, I contemplate that changes may be made therein without departing from the spirit and scope of my invention.

Vhat I claim is:

1. A traveling screen comprising a pair of spaced double-linked chains, a row of frames disposed between the chains, screens on said frames, and means for securing the screens on the frames and for securing the screens and the frames to the chains comprising bars having outwardly extending flanges on the ends of the screens which flanges lie against the lateral edges of adjacent pairs of links, attaching members secured to the flanges and disposed between the links, and pins passing throu h said members and both links of each dou le-link for rigidly but detachably securing the screens to the chain links.

2. A traveling screen comprising in combination, a pair of spaced chains wherein the links are arranged in pairs to form double-linked chains having rollers therebetween for engagement with the means for pulling the chain, a row of frames disposed betweenthe chains, screens on said frames, brackets disposed on the ends of said frames adjacent the chains, and connecting meinbers for detachably ixing the brackets to both links of pairs of links in the adjacent chains, said connecting member passing through said frame, whereby the screen frames will be borne substantially equally by the individual links in the pairs of links.

3. A traveling screen formed by a plurality of screen units arranged in a row to form a belt; each unit comprising a screen member suported in a frame, outwardly extendin anges at the ends thereof, pairs of space links arranged at the ends of the screen members with theirlateral edges lying against the flanges, projections on the flanges extending between the spaced .links of the associate pairs, and lockingpins at the ends of the screen members passing through the frame the associated projections and spaced links intermediate their ends for fixing the links to the screen; and pivot pins for connecting the ends of successive pairs of links to form lateral chains.

a. A traveling screen comprising a rec tangular frame, a 'screen flanged to lit oversaid frame, bars having projecting uards secured to the sides of said frame, a ange'd member secured at each end of said frame, said bars and members holding the screen to said frame, pairs of spaced links adjacent the ends of said screen, a bracket fixed to each of said frame members and fitted between said links, and removable pins for securing said frame to said links, said pins passing through said links, brackets, anged 10 members and the ends of said frame.

In Witness whereof, I hereunto subscribe my name this 16th day of December, 1924.

' BERNHARD SCHROEDER. 

